Date of Award

6-1988

Degree Name

Master of Science

Department

Geosciences

First Advisor

Dr. W. Thomas Straw

Second Advisor

Dr. Gerry Clarkson

Third Advisor

Dr. Richard Passero

Fourth Advisor

Dr. William Sauck

Access Setting

Masters Thesis-Open Access

Abstract

Surface electrical resistivity successfully defined brine contamination within a glacial drift aquifer in western Michigan. The study site is in a residential area of eastern Ottawa County, in the Walker Oil Field. A Schlumberger array with a maximum current electrode separation (AB/2) of 316 meters (1037 feet) was used. It was possible to detect geoelectric layers to about 30 meters (100 feet) below ground level, with the maximum current penetration of about 1/10 (AB/2). On occasion, thick surficial clay precluded detecting deeper geoelectric layers. Through use of the INVERS computer program, fifty vertical electrical soundings were interpreted and correlated with geological, geophysical and water quality data. Low resistivity zones were identified on several geoelectric sections within the glacial sand aquifers adjacent to water wells in which relatively high levels of chloride and specific conductance had been detected. The conclusion is that these low resistivity layers represent groundwater contamination zones.

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